ＳＯＮＧＣｈｕｎｙｕａｎ. J. Journal of Beijing Normal University(Natural Science), 2012, 48(4): 341-345.
Citation: ＳＯＮＧＣｈｕｎｙｕａｎ. J. Journal of Beijing Normal University(Natural Science), 2012, 48(4): 341-345.
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